#include <stdio.h>
void swap(int a, int b);

int main() 
{
    int a = 5;
    int b = 6;

    swap(a,b);

    printf("a=%d b=%d\n", a, b);

    return 0;
}

void swap(int a, int b) 
{
    int t = a;
    a = b;
    b = t;
}